The vault, a prebuilt concrete structure, will house pipe connections.

Four vaults have already been installed under two east-side streets:

Two side-by-side on Southeast 147th Avenue at Division Street

One at Southeast 159th Avenue at Harrison Street

One at Southeast 42nd Avenue at Division Street

Three other vaults are scheduled to be installed within the next six months on Southeast Division Street:

One at Southeast 67th Avenue

One at Southeast 68th Avenue

One at Southeast 162nd Street

The construction work means more traffic disruptions. Starting Wednesday, crews will close an eastbound lane on Southeast Division between 66th and 68th avenues. Traffic on Southeast 67th Avenue between Division and Ivon streets will be open to local access only. Detour signs will be posted and sidewalks will remain open to pedestrians.

Typically, crews work 7 a.m. to 4 p.m, Monday through Friday. The work on this project is expected to take up to 45 days.